<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{ red: item.price > 100 }">{{ item.price }}</td>
            <td>{{ formatDate(item.time) }}</td>
            <td><a href="#" @click="delFn(item.id)">删除</a></td>
          </tr>
        </tbody>
        <tr style="background-color: #eee">
          <td>统计:</td>
          <td colspan="2">总价钱为: {{ allPrice }}</td>
          <td colspan="2">平均价: {{ avgPrice }}</td>
        </tr>

        <tfoot v-if="list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model.trim="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn()">
          添加资产
        </button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from "moment";
export default {
  data() {
    return {
      name: "", // 名称
      price: "", // 价格
      list: [
        { id: 100, name: "外套", price: 199, time: new Date("2010-08-12") },
        { id: 101, name: "裤子", price: 34, time: new Date("2013-09-01") },
        { id: 102, name: "鞋", price: 25.4, time: new Date("2018-11-22") },
        { id: 103, name: "头发", price: 19900, time: new Date("2020-12-12") },
      ],
    };
  },
  methods: {
    addFn() {
      if (this.name.length === 0 || this.price.length === 0)
        return alert("请输入资产名称与价格");

      this.list.push({
        id: this.list.length > 0 ? this.list[this.list.length - 1].id + 1 : 100,
        name: this.name,
        price: this.price,
        time: new Date(),
      });

      this.name = "";
      this.price = "";
    },
    delFn(id) {
      this.list.forEach((item, index, arr) => {
        if (item.id === id) {
          this.list.splice(index, 1);
        }
      });
    },
    formatDate(date) {
      return moment(date).format("YYYY-MM-DD");
    },
  },
  computed: {
    allPrice() {
      let sum = 0;
      this.list.forEach((item) => (sum += item.price));
      return sum.toFixed(2);
    },
    avgPrice() {
      if (this.list.length === 0) return 0;
      return (this.allPrice / this.list.length).toFixed(2);
    },
  },
};
</script>

<style >
.red {
  color: red;
}
</style>